A hiker arrived one rainy night at a spot where three paths met. Looking around anxiously for the signpost that would tell him which path to take to his destination, he saw it fallen into some nearby bushes. Picking it up, and with little need to think, he put it back up and continued on the correct path. How do you think he managed this?
Answer after the break.
The signpost has three pointers. He set it up so the pointer bearing the name of the town he had just come from pointed along the road from that town.